Looking for a McKay - emigrated from Ulster

[PPS]

Nothing more has been discovered about this gentleman in connection with Canada unfortunately, but I live in hope. I have a possible favour I could call in, but I am reluctant to do so unless really necessary.

One thing I completely missed in information that was sent to me some time ago was a previous Regiment.

It appears that this Andrew John McKay transferred from The Midland Regiment to the Royal Rifles sometime before October 1941. Does anyone know if there is a Regimental Association connected with The Midland Regiment that might have historic documents, etc?

I also now have his mother's maiden name which will hopefully allow me to track down a birth year, initially anyway.

Paul.